Main.cc: In function 'int main()':
Main.cc:10:18: error: expected ';' before '<=' token
for(int i=3,i<=n;i++){
^
Main.cc:10:18: error: expected primary-expression before '<=' token
Main.cc:11:31: error: array must be initialized with a brace-enclosed initializer
long long a[i]=x*a[i-1];
^